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PTH04070WAS Datasheet(PDF) 12 Page - Texas Instruments

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No. de pieza PTH04070WAS
Descripción Electrónicos  3-A, 3.3/5-V INPUT ADJUSTABLE SWITCHING REGULATOR
PDF  15 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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PTH04070WAS Datasheet(HTML) 12 Page - Texas Instruments

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Inhibit
GND
GND
RSET
0.05 W
1%
C1
Ceramic
C2
Ceramic
PTH04070W
2
4
3
1
5
VO Adj
GND
VO
VIN
47-
µF
47-
µF
VI = 5 V
VO = 1.8 V
Inhibit
BSS138
Q1
6.65 k
L
O
A
D
t − 5 ms/div
VO (1 V/div)
II (1 A/div)
Q1, Vgs (10 V/div)
PTH04070W
SLTS227 – SEPTEMBER 2004
Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then
turned off, the module will execute a soft-start power-up sequence. A regulated output voltage is produced within
20 msec. Figure 12 shows the typical rise in the output voltage, following the turn off of Q1. The turn off of Q1
corresponds to the fall in the waveform, Q1 Vgs. The waveforms were measured with a 2-A resistive load.
Figure 11. On/Off Inhibit Control Circuit
Figure 12. Power Up Response From Inhibit Control
12



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